Questions 1 through 11 refer to the graph above.
1) Put a small circle around the point where the material starts melting.
2) Put a small square around the point where the material stops boiling.
3) What is the freezing temperature of this substance?
4) What is the melting temperature of this substance?
5) What is the boiling point of this substance?
6) How many calories are released when the liquid freezes?
7) When a substance condenses is heat absorbed or released?
8) How much energy is needed to boil the liquid?
9) How much energy is needed to melt the solid?
10) Start with the liquid phase at 50°C. If 250 calories are removed what is the new phase? What is the temperature?
11) Notice that the temperature does not change when the material is melting, even though energy is being pumped into
it. What is the energy used for?
On the graph above, draw a phase change graph with the following characteristics:
Freezing point = 30° Boiling point = 90°
It takes 100 cal to raise the temperature from 0° to 30° and 200 cal to melt it. It takes 200 more calories
to raise the temperature to boiling and another 300 cal to boil it.